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Important Volcano Facts Most of Earth’s volcanoes are _______________. There are more than 600 __________ volcanoes. Magma( A) is ______ ______ than the rock (B) around it. Because of this, magma _________ towards Earth’s surface. Lease dense magma Volcanoes occur 3 places: 1. divergent boundaries At divergent boundaries under water, long deep cracks called ______ are formed. Magma flows through these cracks and is ______ by seawater. 2. convergent boundaries o At convergent boundaries, magma is created in the subduction zone and forced ______ to the surface. Subduction zones occur when _____ _________ oceanic plate sinks below the ______ dense continental plate, allowing least dense magma to rise. 3. hot spots (hotspots): is a portion of the Earth's surface that may be far from tectonic plate boundaries and that experiences volcanism due to a rising mantle plume, such as in __________. Plate __________ past the plume creating a ________ of volcanoes. Hot spots are extremely _____ areas of the mantle, where magma is forced up through the crust to form new land.